Return-Path: Received: from out004.verizon.net ([206.46.170.142] verified) by logan.com (CommuniGate Pro SMTP 4.1.3) with ESMTP id 2579401 for flyrotary@lancaironline.net; Sun, 14 Sep 2003 21:08:23 -0400 Received: from [65.239.43.200] ([67.227.200.2]) by out004.verizon.net (InterMail vM.5.01.05.33 201-253-122-126-133-20030313) with ESMTP id <20030915010817.WHSC25700.out004.verizon.net@[65.239.43.200]> for ; Sun, 14 Sep 2003 20:08:17 -0500 Mime-Version: 1.0 X-Sender: res0c5l1@incoming.verizon.net Message-Id: In-Reply-To: References: Date: Sun, 14 Sep 2003 18:07:42 -0700 To: "Rotary motors in aircraft" From: Ken Welter Subject: [FlyRotary] Re: Good news, Bad news Content-Type: multipart/alternative; boundary="============_-1148534352==_ma============" X-Authentication-Info: Submitted using SMTP AUTH at out004.verizon.net from [67.227.200.2] at Sun, 14 Sep 2003 20:08:16 -0500 --============_-1148534352==_ma============ Content-Type: text/plain; charset="us-ascii" ; format="flowed" >Russell, Just as a sanity check, before doing anything drastic, >check your pitot static system for restrictions. If that looks good, >swap in an ASI known to be good. You could just be having instrument >failure. It's hard to imagine even the B.U.C. killing off 40 kts. or >more. > >Rick Girard > >Good thought, but I looked at the GPS a couple times today, and it >was always in the ballpark of the ASI. Also, the cross-check is my >dismal climb rate. My friend's 160 HP RV-3 climbs at 100 kts, and >2100 fpm. I have 200+ HP available, and can't even get to 100 kts >in climb. Best climb rate I've seen was 1500 fpm, and I didn't see >more than 1000 fpm today. I should be looking at about 160 kts >without wheel pants and gear leg fairings, and I'm seeing only 113 >kts or so. Very depressing... > >The only other variable is the prop. I'm using a 3 blade Warp Drive >prop, and I'm starting to question how well it may be working. It's >certainly absorbing the power, but is it effectively turning that >power into thrust? How can I know? Anyone else running a Warp >Drive on a fast plane? > >I do agree that it's time to step back and make some well >reasoned observations, rather than taking a chainsaw to anything >yet. For sure, the cowl has to go eventually, but I really didn't >want to have to do that now. I've thought about replacing the >radiator, and modifying the cowl into yet another temporary shape, >but that's a lot of work for another temporary cowl. > >Thanks, >Rusty > I am running a 70 inch five blade warp drive on my coot with a 2.95 gear ratio and I pitch my prop at 16 to 18 degrees of pitch. What ratio are you running, it seems that 12 to 14 degrees on a three blade is a bit flat to get any speed unless you have a 2.17 ratio. Ken welter --============_-1148534352==_ma============ Content-Type: text/html; charset="us-ascii" [FlyRotary] Re: Good news, Bad news
Russell, Just as a sanity check, before doing anything drastic, check your pitot static system for restrictions. If that looks good, swap in an ASI known to be good. You could just be having instrument failure. It's hard to imagine even the B.U.C. killing off 40 kts. or more.

Rick Girard 
 
Good thought, but I looked at the GPS a couple times today, and it was always in the ballpark of the ASI.  Also, the cross-check is my dismal climb rate.  My friend's 160 HP RV-3 climbs at 100 kts, and 2100 fpm.  I have 200+ HP available, and can't even get to 100 kts in climb.  Best climb rate I've seen was 1500 fpm, and I didn't see more than 1000 fpm today.  I should be looking at about 160 kts without wheel pants and gear leg fairings, and I'm seeing only 113 kts or so.  Very depressing...
 
The only other variable is the prop.  I'm using a 3 blade Warp Drive prop, and I'm starting to question how well it may be working.  It's certainly absorbing the power, but is it effectively turning that power into thrust?  How can I know?  Anyone else running a Warp Drive on a fast plane?
 
I do agree that it's time to step back and make some well reasoned observations, rather than taking a chainsaw to anything yet.  For sure, the cowl has to go eventually, but I really didn't want to have to do that now.  I've thought about replacing the radiator, and modifying the cowl into yet another temporary shape, but that's a lot of work for another temporary cowl.  
 
Thanks,
Rusty
  
  I am running a 70 inch five blade warp drive on my coot with a 2.95 gear ratio and I pitch my prop at 16 to 18 degrees of pitch.
 What ratio are you running, it seems that 12 to 14 degrees on a three blade is a bit flat to get any speed unless you have a 2.17 ratio.

 Ken welter
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